3GN2

Structure of Pteridine Reductase 1 (PTR1) from TRYPANOSOMA BRUCEI in ternary complex with cofactor (NADP+) and inhibitor (DDD00066730)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.146 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

One scaffold, three binding modes: novel and selective pteridine reductase 1 inhibitors derived from fragment hits discovered by virtual screening.

Mpamhanga, C.P.Spinks, D.Tulloch, L.B.Shanks, E.J.Robinson, D.A.Collie, I.T.Fairlamb, A.H.Wyatt, P.G.Frearson, J.A.Hunter, W.N.Gilbert, I.H.Brenk, R.

(2009) J.Med.Chem. 52: 4454-4465

  • DOI: 10.1021/jm900414x
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The enzyme pteridine reductase 1 (PTR1) is a potential target for new compounds to treat human African trypanosomiasis. A virtual screening campaign for fragments inhibiting PTR1 was carried out. Two novel chemical series were identified containing a ...

    The enzyme pteridine reductase 1 (PTR1) is a potential target for new compounds to treat human African trypanosomiasis. A virtual screening campaign for fragments inhibiting PTR1 was carried out. Two novel chemical series were identified containing aminobenzothiazole and aminobenzimidazole scaffolds, respectively. One of the hits (2-amino-6-chloro-benzimidazole) was subjected to crystal structure analysis and a high resolution crystal structure in complex with PTR1 was obtained, confirming the predicted binding mode. However, the crystal structures of two analogues (2-amino-benzimidazole and 1-(3,4-dichloro-benzyl)-2-amino-benzimidazole) in complex with PTR1 revealed two alternative binding modes. In these complexes, previously unobserved protein movements and water-mediated protein-ligand contacts occurred, which prohibited a correct prediction of the binding modes. On the basis of the alternative binding mode of 1-(3,4-dichloro-benzyl)-2-amino-benzimidazole, derivatives were designed and selective PTR1 inhibitors with low nanomolar potency and favorable physicochemical properties were obtained.


    Organizational Affiliation

    Division of Biological Chemistry and Drug Discovery, College of Life Sciences, University of Dundee, Dundee DD1 5EH, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Pteridine reductase
A, B, C, D
288Trypanosoma brucei bruceiMutation(s): 0 
Gene Names: PTR1
Find proteins for O76290 (Trypanosoma brucei brucei)
Go to UniProtKB:  O76290
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
NAP
Query on NAP

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Download CCD File 
A, B, C, D
NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
2'-MONOPHOSPHOADENOSINE 5'-DIPHOSPHORIBOSE
C21 H28 N7 O17 P3
XJLXINKUBYWONI-NNYOXOHSSA-N
 Ligand Interaction
AX8
Query on AX8

Download SDF File 
Download CCD File 
A, B, C, D
1-(3,4-dichlorobenzyl)-1H-benzimidazol-2-amine
C14 H11 Cl2 N3
JBNABAJVIVYIDA-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
AX8Ki: 400 nM (100) BINDINGDB
AX8Ki: 400 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.146 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 74.895α = 90.00
b = 90.778β = 115.85
c = 82.861γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
MOLREPphasing
REFMACrefinement
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-12-29
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Refinement description, Version format compliance
  • Version 1.2: 2011-09-07
    Type: Atomic model, Database references